Geometry

The correct answer is A. , .

 

1. Recall the concept of an angle formed by rays:

An angle is made up of two rays that share a common endpoint (the vertex). For , the vertex is point .

The rays that form the angle should start from the vertex .

One ray starts from  and passes through , which is written as . The other ray starts from  and passes through , which is written as .

 

2. Analyze each option:

A: Since the vertex of  is , and  and  are two rays starting from  that form the angle, this option is correct.

 

B: The ray

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